Chronology of OPEC Metrication:

VEN Time Zone -4 Venezuela Caracas
Metric System Adoption: 1857 *
Compulsory Metric Implementation: 1912-14
United Nations Member: 15 Nov 1945
Note: International paper size A4 is the established ISO standard adopted by all countries in the world (except the United States and Canada) as well as the official United Nations document format size. Mexico, Costa Rica, Colombia, Venezuela, Chile and the Philippines are places where the US Letter Format is still in common use, despite their official adoption of the ISO standard.
* Metric versus English [Published in 1921] Page 27